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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | $ 14,272 | $ (5,059) | $ 30,449 | $ (24,112)
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses | (3,496) | 1,240 | (7,458) | 5,907
Net of Tax |  |  |  |
Other comprehensive income (loss) | 10,776 | (3,819) | 22,991 | (18,205)
Net unrealized gains/losses |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized gain/loss during the period | 14,140 | (5,335) | 29,892 | (24,686)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (271) | (170) | (271) | (294)
Net unrealized gains/losses | 13,869 | (5,505) | 29,621 | (24,980)
Tax (Expense) Benefit |  |  |  |
Change in net unrealized gain/loss during the period | (3,464) | 1,307 | (7,322) | 6,048
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 67 | 42 | 67 | 72
Net unrealized gains/losses | (3,397) | 1,349 | (7,255) | 6,120
Net of Tax |  |  |  |
Change in net unrealized gain/loss during the period | 10,676 | (4,028) | 22,570 | (18,638)
Net of tax | (204) | (128) | (204) | (222)
Other comprehensive income (loss) | 10,472 | (4,156) | 22,366 | (18,860)
Amortization of net retirement plan actuarial gain |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 400 | 442 | 821 | 860
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (98) | (108) | (201) | (211)
Net of Tax |  |  |  |
Net of tax | 302 | 334 | 620 | 649
Amortization of net retirement plan prior service cost |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 3 | 4 | 7 | 8
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (1) | (1) | (2) | (2)
Net of Tax |  |  |  |
Net of tax | 2 | 3 | 5 | 6
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | 403 | 446 | 828 | 868
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses | (99) | (109) | (203) | (213)
Net of Tax |  |  |  |
Other comprehensive income (loss) | $ 304 | $ 337 | $ 625 | $ 655

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